Display sheet, method for producing display sheet, display apparatus, and electronic device

Abstract

A display sheet has a display layer, a first electrode on one side of the display layer, a second electrode on another side of the display layer, and an electrode protection layer between the display layer and the first electrode. The display layer has a partition structure dividing the display layer into a plurality of regions and a liquid dispersion filling the individual regions. The electrode protection layer and the partition structure are integrally formed and both mainly composed of an electroconductive polymer.

What is claimed is:  
     
       1. A display sheet comprising:
 a display layer; 
 a first electrode on one side of the display layer; 
 a second electrode on another side of the display layer; and 
 an electrode protection layer between the display layer and the first electrode, wherein: 
 the display layer has a partition structure dividing the display layer into a plurality of regions and a liquid dispersion of at least one positively or negatively charged particulate material in a dispersion medium and filling each of the plurality of regions; and 
 the electrode protection layer and the partition structure are integrally formed and both mainly composed of an electroconductive polymer, wherein the electroconductive polymer is an ultraviolet-curable polymer having an ethylene oxide side chain. 
 
     
     
       2. The display sheet according to  claim 1 , wherein the ethylene oxide side chain is a group represented by a chemical formula (CH 2 —CH 2 —O—) n — where the subscript n is an integer of 2 to 20. 
     
     
       3. The display sheet according to  claim 1 , further comprising an adhesive layer between the display layer and the second electrode. 
     
     
       4. The display sheet according to  claim 3 , wherein a distal end portion of the partition structure is embedded in the adhesive layer. 
     
     
       5. The display sheet according to  claim 3 , wherein the adhesive layer is made of a thermoplastic material. 
     
     
       6. The display sheet according to  claim 1 , wherein the partition structure is tapered, getting narrower toward a distal end thereof. 
     
     
       7. A method for producing a display sheet having a display layer, a first electrode on one side of the display layer, and a second electrode on another side of the display layer, comprising:
 forming a resin layer mainly composed of an electroconductive polymer on the first ethylene, wherein the electroconductive polymer is an ultraviolet-curable polymer having an ethylene oxide side chain; 
 forming a plurality of depressions in the resin layer to integrally form a partition structure separating a plurality of regions and an electrode protection layer covering the first electrode; 
 filling each of the plurality of regions with a liquid dispersion of at least one positively or negatively charged particulate material in a dispersion medium; and 
 forming the second electrode above the partition structure to seal the depressions. 
 
     
     
       8. The method for producing a display sheet according to  claim 7 , wherein the partition structure and the electrode protection layer are formed by pressing a die having a plurality of projections against the resin layer. 
     
     
       9. The method for producing a display sheet according to  claim 7 , wherein the partition structure and the second electrode are joined using an adhesive layer. 
     
     
       10. The method for producing a display sheet according to  claim 9 , wherein the partition structure and the second electrode are joined by pressing the partition structure against the adhesive layer to stick a distal end portion of the partition structure into the adhesive layer. 
     
     
       11. The method for producing a display sheet according to  claim 10 , wherein the adhesive layer is softened before the partition structure and the second electrode are joined. 
     
     
       12. A display apparatus comprising the display sheet according to  claim 1 . 
     
     
       13. A display apparatus comprising the display sheet according to  claim 2 . 
     
     
       14. A display apparatus comprising the display sheet according to  claim 3 . 
     
     
       15. A display apparatus comprising the display sheet according to  claim 4 . 
     
     
       16. A display apparatus comprising the display sheet according to  claim 5 . 
     
     
       17. A display apparatus comprising the display sheet according to  claim 6 . 
     
     
       18. An electronic device comprising the display apparatus according to  claim 12 .